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authorMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-11-19 12:17:49 +0100
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-11-26 08:05:24 +0100
commit020120af21a643c6adaa4f090c3abf275e3edd68 (patch)
tree419d8fef5b036ed97c43c7aa3844aac231cc685d
parentb087982886e24dd9b50457d4263910ae671be177 (diff)
media: vidtv.rst: update vidtv documentation
Update the vidtv documentation with the relevant changes after the last patches. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
-rw-r--r--Documentation/driver-api/media/drivers/vidtv.rst85
1 files changed, 72 insertions, 13 deletions
diff --git a/Documentation/driver-api/media/drivers/vidtv.rst b/Documentation/driver-api/media/drivers/vidtv.rst
index edaceef2808c..52c201798d78 100644
--- a/Documentation/driver-api/media/drivers/vidtv.rst
+++ b/Documentation/driver-api/media/drivers/vidtv.rst
@@ -258,6 +258,42 @@ Using dvb-fe-tool
The first step to check whether the demod loaded successfully is to run::
$ dvb-fe-tool
+ Device Dummy demod for DVB-T/T2/C/S/S2 (/dev/dvb/adapter0/frontend0) capabilities:
+ CAN_FEC_1_2
+ CAN_FEC_2_3
+ CAN_FEC_3_4
+ CAN_FEC_4_5
+ CAN_FEC_5_6
+ CAN_FEC_6_7
+ CAN_FEC_7_8
+ CAN_FEC_8_9
+ CAN_FEC_AUTO
+ CAN_GUARD_INTERVAL_AUTO
+ CAN_HIERARCHY_AUTO
+ CAN_INVERSION_AUTO
+ CAN_QAM_16
+ CAN_QAM_32
+ CAN_QAM_64
+ CAN_QAM_128
+ CAN_QAM_256
+ CAN_QAM_AUTO
+ CAN_QPSK
+ CAN_TRANSMISSION_MODE_AUTO
+ DVB API Version 5.11, Current v5 delivery system: DVBC/ANNEX_A
+ Supported delivery systems:
+ DVBT
+ DVBT2
+ [DVBC/ANNEX_A]
+ DVBS
+ DVBS2
+ Frequency range for the current standard:
+ From: 51.0 MHz
+ To: 2.15 GHz
+ Step: 62.5 kHz
+ Tolerance: 29.5 MHz
+ Symbol rate ranges for the current standard:
+ From: 1.00 MBauds
+ To: 45.0 MBauds
This should return what is currently set up at the demod struct, i.e.::
@@ -316,7 +352,7 @@ For this, one should provide a configuration file known as a 'scan file',
here's an example::
[Channel]
- FREQUENCY = 330000000
+ FREQUENCY = 474000000
MODULATION = QAM/AUTO
SYMBOL_RATE = 6940000
INNER_FEC = AUTO
@@ -337,6 +373,14 @@ You can browse scan tables online here: `dvb-scan-tables
Assuming this channel is named 'channel.conf', you can then run::
$ dvbv5-scan channel.conf
+ dvbv5-scan ~/vidtv.conf
+ ERROR command BANDWIDTH_HZ (5) not found during retrieve
+ Cannot calc frequency shift. Either bandwidth/symbol-rate is unavailable (yet).
+ Scanning frequency #1 330000000
+ (0x00) Signal= -68.00dBm
+ Scanning frequency #2 474000000
+ Lock (0x1f) Signal= -34.45dBm C/N= 33.74dB UCB= 0
+ Service Beethoven, provider LinuxTV.org: digital television
For more information on dvb-scan, check its documentation online here:
`dvb-scan Documentation <https://www.linuxtv.org/wiki/index.php/Dvbscan>`_.
@@ -346,23 +390,38 @@ Using dvb-zap
dvbv5-zap is a command line tool that can be used to record MPEG-TS to disk. The
typical use is to tune into a channel and put it into record mode. The example
-below - which is taken from the documentation - illustrates that::
+below - which is taken from the documentation - illustrates that\ [1]_::
- $ dvbv5-zap -c dvb_channel.conf "trilhas sonoras" -r
- using demux '/dev/dvb/adapter0/demux0'
+ $ dvbv5-zap -c dvb_channel.conf "beethoven" -o music.ts -P -t 10
+ using demux 'dvb0.demux0'
reading channels from file 'dvb_channel.conf'
- service has pid type 05: 204
- tuning to 573000000 Hz
- audio pid 104
- dvb_set_pesfilter 104
- Lock (0x1f) Quality= Good Signal= 100.00% C/N= -13.80dB UCB= 70 postBER= 3.14x10^-3 PER= 0
- DVR interface '/dev/dvb/adapter0/dvr0' can now be opened
+ tuning to 474000000 Hz
+ pass all PID's to TS
+ dvb_set_pesfilter 8192
+ dvb_dev_set_bufsize: buffer set to 6160384
+ Lock (0x1f) Quality= Good Signal= -34.66dBm C/N= 33.41dB UCB= 0 postBER= 0 preBER= 1.05x10^-3 PER= 0
+ Lock (0x1f) Quality= Good Signal= -34.57dBm C/N= 33.46dB UCB= 0 postBER= 0 preBER= 1.05x10^-3 PER= 0
+ Record to file 'music.ts' started
+ received 24587768 bytes (2401 Kbytes/sec)
+ Lock (0x1f) Quality= Good Signal= -34.42dBm C/N= 33.89dB UCB= 0 postBER= 0 preBER= 2.44x10^-3 PER= 0
-The channel can be watched by playing the contents of the DVR interface, with
-some player that recognizes the MPEG-TS format, such as *mplayer* or *vlc*.
+.. [1] In this example, it records 10 seconds with all program ID's stored
+ at the music.ts file.
+
+
+The channel can be watched by playing the contents of the stream with some
+player that recognizes the MPEG-TS format, such as ``mplayer`` or ``vlc``.
By playing the contents of the stream one can visually inspect the workings of
-vidtv, e.g.::
+vidtv, e.g., to play a recorded TS file with::
+
+ $ mplayer music.ts
+
+or, alternatively, running this command on one terminal::
+
+ $ dvbv5-zap -c dvb_channel.conf "beethoven" -P -r &
+
+And, on a second terminal, playing the contents from DVR interface with::
$ mplayer /dev/dvb/adapter0/dvr0

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